Thermostat and like device.



G. F. JOHNSON. THERMOSTAT AND LIKE DEVICE. APPLICATION FILED OCT. 31, 1913. I 1, 1 09,993. Patented Sept. 8, 191% 3 SHEETS SHEET 1.

G. P. JOHNSON.

THERMOSTAT AND LIKE DEVICE. APPLICATION FILED OUT-1. 31, 1913. 1, 1 09,993, Patented Sept. 8, 1914;

s SHBBTSSHEET 2.

G. P. JOHNSON. THERMOSTAT AND LIKE DEVICE. APPLICATION FILED OUT. 31, 1913.

Patented Sept. 8, 1914'.

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3 SHEETS-SHEET 3.-

CARL F. JOIDISON,

COMPANY, OF

OF MILWAUKEE, WISCONSIN, ASSIGNOB TO JOHNSON SERVICE MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

THERMOSTAT AND. LIKE DEVICE.

To all Q0710? it may concern:

Be it known that I, CARL F. JoHXsoN, a citizen of the United States, residing at Milwaukee. in the county of Milwaukee and State of \Visconsin,;.have invented certain new and useful Improvements in Therm stats-and like Devices, of which the following is a specification. I

This invention relates to thermostats, hyg'rostats and the like, of the pressure m0- tor type and more particularly to devices of this class operating by the control of a minute vent port by an element responsive to atmospheric changes. Briefly stated such systems involve the use:of an elementresponsive to atmospheric changes, such as a thermostatic bar, or an element responsive to atmospheric humidity or the like,-

to operate a valve to. open oraclosea leak port from a diaphragm chamber. Compressed air is constantly supplied to this chamber, at a less rate than the rate of outflow through the leakport so that the opening and closing of the leak port effects the automatic release and accumulation of pressure against the diaphragm and this by means of an interposed quick throw mechanism shifts a pilot valve between supply and exhaust positions to supply and exhaust pressure fluid to and from somecontrolled device such as a valve'or damper motor.

The present invention resides in certain refinements of design and arrangement of the parts of the device as wellas in certain novel mechanical features, and results in a reduction of the number of parts; a reduction in the size of the instrument; ready access to all working parts, and the ports and passages without destroying adjustments; easy adjustment of all working parts and ready convertibility, to a' thermostat, hygrostat or other automatic control device. Ot er advantages will be apparent on inspection.

Except as noted I illustrate the invention as applied to a thermostat in the accompanying drawings, in which.-

' Figure 1 is'a. Vertical section of the thermostat on the line 11 ofFig. 2; Fig. 2 is a front elevation of the complete ther mostat with the coverremoved; Fig. 3' 1s.

a perspective view of the combined needle valve and leak port; Fig. 4 is an elevation,

partly in section of onefof the needle valves Specification of Letters Patent. Application filed October a1; 1913.

.upper end of the flanged aperture the lug '26 and flange 25 to Serial No. 798,603.

used in.-the.wallI pipe-head; Fig. 5'is a section-cn the-dine 5.5-of Fig. 1; Fig. 6 is a section on'the line 66 of Fig. 1; Fig. 7

is a section on the line 7-7 of Fig.2; Fig. 8:15 a perspec'tiye view of "the complete device with the cover removed; Fig. 9 is a detail V ew partlyv in section showing the mounting of the thermostatic bar and motor arm; Fig. 10 is a detail view partly in section showing the common fulcrum for the thermostatic bar saddle, and the motor arm: Fig. 11 is a static bar and its saddle; Fig. 12 is a detail View, partly in-section, of the indicator dial; F1g.-13 is a fragmentary perspectiveview of-ithe motor arm and its adjusting screw; F1 14- is -a.-front elevation of the metal p aster back-7 with pipe head attached; F 1g. 15 is a perspective View showing the external appearance of the thermostat with its cover; Fig. 16 is a rear elevation of the complete device showing the 'plaster back and pipe head. Fig. 17 shows a control element sensitive to humidity substituted for the thermostatic bar to functioning under changes of atmospheric humidity, and Fig- 18 is a fragmentary elevation showing the dial used with the device ofFig. 17

Inthe drawings 19is the sheet metal plaster back or wall mount used to sup port the device in aplastered wall. It is fastened. to-the wall by means of nails or screws passed through the holes 20. At the plaster back' is a round inwhich is held the pipe head 21 which has a connection 22 for the air supply-pipeeand aconnection 23 for the pipe leadingto the diaphragm motor or other controlled device. Needle valves 24 shown imdetail. in Figs. 4 and 5 control the flow through the passages of the pipe head.

Patented Sept. 8, 1914..

perspective view of the thermo produce a. device- The flanged aperture in the plaster back has an interrupted rearflange 25 and at 1ts upper side a small inturned lug 26 spaced forwardly from the flange 25. pipe head 21 has been connected and the plastering-has reached stage the-plaster-fback is slipped upwardly over the pipe head and then swung to cause 1 After the to its pipes uPP r edge-0f the-head 21. A screw 27=is straddle the the proper then inserted and fastens .the pipe head and back securely together, so that when the off-D back is fastened to the wall the pipe head is also rigidly supported and in proper po sition to receive the thermostat frame 28.

The thermostat frame 28 is a casting pref- 5 erably of brass and is held against the pipe head 21 by two screws 29, a rubber gasket being interposed. The frame 28 has an l.

shaped recess 31 and a round recess 32 which communicate through corresponding aperw tures in gasket 30 with the connections 22 and 23 respectively. The apertures in the gasket 30 are filled by felt inserts 33 which act as filters. The removal of the frame 28 by releasing screws 29 afiects none of the thermostat adjustments and gives ready access to the filters 33 and to the needle valves 24:.

The frame 28 has at its upper end a valve chamber 34: having'a duct 35 leading from 2 recess 31 and supply connection 22, and'a duct 36 leading to connection 23. The outer end of chamber 34 is closed by a threaded head 37 through which slides the stem 38 of a double seated valve 39. When the valve 25 seats to the right (in Fig. 1) it closes 0d the airsupply to chamber 34 and permits pressure to exhaust from the chamber around stem 38 thus exhausting air from the damper motor or other controlled device-cona nected to connection 23. When valve 39 seats to the left the exhaust is closed and pressure is admitted as will be obvious.

Leading from the lower end of the l..- shaped recess 31 extends a port 40 to a 35 chamber 41, which by a passage d2 is in free communication with a diaphragm chamber 4:3 in frame 28. The front of the chamber 43 is closed by a flexible diaphragm 4A, usually of rubber, held in place by clamp ring 40 4:5 and screws 46. Screwed into the front of chamber 41 and making a tight joint by means of a thick soft rubber gasket a7 is the combined needle valve and leak tube 48., preferably of nickel. This is provided with 45 a conical end 49 serving as a needle valve,

a minute axial leak port 50 (necessarily exaggerated in size in the drawings) and'a sealing flange 51. A. screw driver slot 52 offers ready means of adjusting the needle 50 valve and the elasticity of gasket 47 permits the required movement. The correct adjustment is such that the inflow to chambers t1 and 43 is less than the free outflow through the leak port so that when the leak port is open the diaphragm will collapse.

' The lower end of form of an open rectangular frame 53 at each side of which is a forwardly extending lug 54k. Threaded one in each lug 5d are two 69 alined pivots 55, the lugs 5% being slotted at 56 to BXBIB a resilient clamping action on the ivots. The inner ends of the pivots 55 are conical and pivotal-1y support a weighted saddle 57, on which is mounted a curved bi- 65 metallic thermostatic bar 58. The upper position is indicated by positions. and in that event the pointer 67 merely exerts a frictional against the upper edge of the dial.

55 is the bifurcated motor arm a plate 70 hearing against and through this, motion is imparted to the motor arm by the diaphragm. .is normally held and fastening it the frame 28 is in the treaties end of the bar stands opposite the end of leak passage 50 and is there provided with an aperture 59 onthe front side of which is clamped a transparent celluloid valve seat 60 by means of a riveted clip 61 having an aperture corresponding to the aperture 59 in the bar. The valve seat 60 is adapted to seal the port 50 under proper flexing of bar 58 due to changes in temperature. The celluloid valve seat does not cut out readily and will not bruise the end of the leak port while its transparency permits inspection of its seating action. By mounting it on the side of the bar away from the leak port all disturbing effect incident to irregular thickness of either bimetallic bar or celluloid is avoided. Threaded into the frame is an adjusting screw 62 whose upper end limits the downward motion of the pivoted saddle 57 By adjusting the screw 62 the valve seat 60 may be set to cldse leak port 50' at any desired temperature. The screw 62 carries a cylindrical dial 63 hearing indicia which may be read through the cover or case hereinafter described. The frame of dial 63 carries a pin 64: which has a double function, the lower end serving as a crank or handle to move thedial and the upper end being a striker which engages a cam lug 65 on saddle 57 in one limiting position of dial 63 to lift the saddle and hold the valve seat 60 clear away from the leak port 50. This the word )ff on in Fig. 9.

66 extends forward dial 63 and is illustrated A resilient wire frame from frame 53 and carries a combined latch and pointer 67 adapted to catch in notches 68 in dial 63 and hold the dial in adjusted The notches 68 may be omitted retaining action by bearing Mounted on the outer ends of the pivots 69. This has diaphragm at The arm 69 spring 71 coninward by a 28. One end nected thereto and to frame "of the spring is attached to frame 28 by in sorting its looped end into an aperture 72 with a pin 73. The other end is also looped and hooked over a lug 74: on arm 69. v

The upper end of the motor arm 69 can ries two spaced plates 7 5 having openings 7 6 through which works a ball 7 7 fast on valve stem 38. An annular coiled spring 78 confined betwecnplates 7 5 surrounds and bears against the ball 77 and as arm 69 moves snaps to one or the other side of the median plane of the ball thus causing a quick throw movement of ball 7 7" and valve 39 opposite in direction to the movement of arm 69.

The movement of the arm 69 is limited by lid device to be device will .readily be und merit may re'a ily h made by turning head 78 The device isinclosed in a case 80 which is attached by screws 81 to the plaster back. The case is provided with apertured sides to permit reeaccess of the surrounding air to the thermostatic strip. An aperture 82 is provided at the bottom of the front of the ase and hrough h the dial. 6 m y be seen.

The device. may be converted into a hygrostat by the substitution of a hygrostatic element .for the thermostatic element, and is then Well adapted for controlling humidifying devices of various kinds. In that case a saddle 83 is su'bstitutedfor the saddle 57 previously described and carries an upright rigid sealing bar 84 (see Fig. 17). This bar is adapted to. seal the leak saddle 83 also carries a bar 85 of some substance which will vary in length with changes in atmospheric humidity. For ex ample a small block of woodcut across grain will operate satisfactorily. This bar 85.c'ar ries a downwardly extending arm '86 at} tached to the upper end of ing at its lower end on the end of the adjusting screw 62. The markings on the dial are changed to correspond to the changed function of the device as indicated in Fig. 18. Any other element responsive to changes in atmospheric conditions may be substituted for the thermostatic or hygrostatic element according to the nature of the controlled. 1 The general principle of operation of the erstood by those skilled in the art,- but certain advantages are secured by the arrangement of parts adopted, and these will now be pointed out.

By using the bifurcated motor arm and placing the valve strip between the legs thereof a great reduction in the len h of the instrument is made possible and t e motor arm serves to protect the sensitive element against in ury. The use of a common pivot for the motor arm and the valve strip reduces the number of parts. The mounting of the. valve strip on a weighted pivoted saddle prevents the sensitive element from ever being subjected to excessive stress, and

allows the valve strip tobe readily swung forward away from the leak port-for in-' spection or repair.

By unhooking the spring 71 from the lug ,74 and giving the screw head 78 a partial turn the motor arm as well as the valve stri may be swung forward out of the .way. hen this has been done the diaphragm may readily be re port 50, The

the bar and bear-' thermostat of a motor; arm adapted to be actuatedby said motor;

the instrument to its original condition of 1 ad3ustment. By removing the screws 29 the entire thermostat me be removed from the pipe head without a ectlng any admstment thereof- .In the following claim I use the term resppnsive element to indicateany element responsive to atmospher c changes such as thermostats, hygrostats and the ike.

Haviugthua described my invention, what claim 18* A 1. A vent port for pressure motor control devices comprising a threaded vent tube and a noodle valve member formed integrally therewi h and adjustable by the ota wn f said tube to control the supply of air to be vented through said tube. I 2, A nt port for pressure. moto ontrol devices having a motor chamber, said port ompri ing thr ad d ent tube adapt d to vent air from said motor chamber, a valve member formed on the inner end of said tube and adjustable by the rotation thereof to control the supplg;l of air to said chamber, and an elastic pac 'ng adapted to permit the. necessary movement of said vent tube to adjust said valve.

3. Thecombination of a pipe head adapted to be "mounted in an, aperture in a wall; a wall plate adapted to be rigidly supported on-said wall over said aperture, and itself provided with an aperture to receive said pipe head; releasable connections adapted to hold said pipe head rigidly to said wall plate; and an automatic cont-r01 device responsive to changes in atmospheric conditions supported solely upon said pipe head.

4. The combination with a pressure motor control device including a motor and a control valve, of an arm adapted to be moved by said motor and operatively connected with said control valve; and a threaded member axially adjustable by a turning movement and having a lateral extension adapted to serve as a limit stop for the movement of said out of operative relation therewith by said turning movement.

'5. The combination with a control device including a motor and a control valve; of a pivoted arm adapted to be moved by said motorand operatively connected to said control valve; and a screw having a later ally extending flange adapted to limit the movements of said arm and cut away at one portion to release said armby a partialiturning of said screw. j

6. The combination in a pressure motor a bifurcated motor 115 arm and movable into and a thermostatic bar positioned between the branches of said motor arm; a common pivotal support for said bar and motor arm; and means for adjusting the position ot said bar. v

7. The combination in an automatic control device of a motor; a bifurcated motor arm adapted to a responsive element adapted to control the action of said motor and positioned between the branches of'said motor arm; a common pivotal support for said arm-and responsive element; and means for adjusting the position of said responsive element.

8. lhe combination with a pressure motor thermostat having the usual diaphragm motorgot a pivotal support; a bifurcated motor arm mounted in said support and adapted to be actuated by said motor; a saddle also pivoted on said support; a thermostatic bar carried by said saddle extending between the legs of said motor arm and adapted to control the operation of said be actuated by said motor;

motor; an adjustable stop adapted to adjust the saddle; and a releasable stop adaptedto limit the movement of said motor arm.

9. The combination with a thermostat having a frame and a motor chamber, of a removable diaphragm for said chamber; a pivoted motor arm adapted to be actuated by said diaphragm and extending over the same; a releasable stop normally retaining said arm in position over said diaphragm; a thermostatic element normally extending over said diaphragm; and an adjusting stop for said thermostatic element adapted to leave the same free to be swung manually away from said diaphragm to permit access to the latter.

in testimony whereof l have signed my name to this specification in-the presence ot two subscribing Witnesses.

CARL F. JOHNSON.

Witnesses PAUL F. JOHNSON, A. A. JOHNSON. 

